Mail Archive Search: <+from:w7iuv@yahoo.com>

Results:

References: [ +from:w7iuv@yahoo.com: 103 ]

Total 103 documents matching your query.

81. Re: Topband: W7IUV Preamp from Low Band DXing (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Mon, 15 Jan 2007 06:13:40 -0800 (PST); I have a similar situation. Fortunately the solution is easy once you accept that even the lowest output RX antenna has far more gain than is need to establish system noise figure. Just use attenuato; /archives//html/Topband/2007-01/msg00278.html (8,551 bytes)
82. Re: Topband: End-Fire Phased BOG,s ? (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Tue, 30 Jan 2007 11:24:44 -0800 (PST); I did almost this exact configuration. It was a bit longer and about 18 inches off the ground. It made quite an improvement over a single wire. I did have a lot of trouble keeping the phasing lines w; /archives//html/Topband/2007-01/msg00469.html (7,887 bytes)
83. Re: Topband: w7iuv preamp. (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Sat, 17 Feb 2007 12:02:46 -0800 (PST); OK, I guess it's time to go through this one more time..... The so called "W7IUV preamp" is documented on my web page under the "rotatable flag" topic. The only place you can be sure of getting the s; /archives//html/Topband/2007-02/msg00185.html (11,410 bytes)
84. Re: Topband: RG-6 Connectors (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Wed, 23 May 2007 05:51:49 -0700 (PDT); -- "Mike(W5UC) & Kathy(K5MWH)" <w5uc@suddenlink.net> wrote: For all my RX antenna feedlines as well as some TX phasing lines I use commercial grade US manufactured F connectors. I would not recommend; /archives//html/Topband/2007-05/msg00068.html (7,962 bytes)
85. Re: Topband: Q of inductors (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Fri, 31 Aug 2007 09:32:12 -0700 (PDT); Roger, FWIW, all the ribbon wound inductors I own measure much less Q than similar sized conventional inductors. 73, Larry - W7IUV DN07dg - central WA http://w7iuv.com _______________________________; /archives//html/Topband/2007-08/msg00145.html (7,764 bytes)
86. Re: Topband: EWE / K9AY (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Wed, 5 Dec 2007 13:18:32 -0800 (PST); Yes, I have. The answer is: "It Depends". If both are installed out in an empty field well away from anything else, the EWE has always shown me slightly better RX performance. However, if you install; /archives//html/Topband/2007-12/msg00058.html (7,858 bytes)
87. Re: Topband: Measuring Inductor Q (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Mon, 7 Jul 2008 06:42:12 -0700 (PDT); The method described by Rick above is what I use with an exception. Instead of the 1 pF coupling capacitors, I use a pair of single turn shielded links. The coil under test can then be physically pla; /archives//html/Topband/2008-07/msg00053.html (10,166 bytes)
88. Re: Topband: Receive pre-amp for Terminated Rx Loop - summary (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Mon, 3 Nov 2008 19:24:36 -0800 (PST); Since there have been literally hundreds of these preamps built using the values shown on my web page, one has to wonder why one would be different. I have a half dozen or so of these things in use a; /archives//html/Topband/2008-11/msg00027.html (8,307 bytes)
89. Topband: Surprises (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Fri, 7 Nov 2008 08:59:50 -0800 (PST); For the last week or so EU and AF has been copied here at my sunset. Nothing unusual about that. Mostly they can't hear me as that's the noisiest part of the night for them. Mostly, I hear the big gu; /archives//html/Topband/2008-11/msg00057.html (8,241 bytes)
90. Re: Topband: Choke baluns (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Fri, 21 Nov 2008 08:43:12 -0800 (PST); There is NO reason to use choke baluns, coils of coax, or ferrite cores on coax when feeding a RX antenna. Beverages, Flags, Pennants, K9AY's, EWE's, all have the same requirement, although the puris; /archives//html/Topband/2008-11/msg00146.html (8,389 bytes)
91. Re: Topband: Choke baluns (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Fri, 21 Nov 2008 10:25:31 -0800 (PST); THAT'S why feedline decoupling is so important. Are you implying that a proper isolation style transformer properly installed does not provide any feedline decoupling? 73, Larry Larry - W7IUV DN07dg; /archives//html/Topband/2008-11/msg00149.html (7,382 bytes)
92. Topband: W7IUV preamp info (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Tue, 30 Dec 2008 12:13:10 -0800 (PST); Recent posts regarding the preamp circuit I have on my web page and which has appeared in ON4UN's book seem to indicate a lot more problems building the circuit recently. I hope to update the preamp; /archives//html/Topband/2008-12/msg00291.html (9,937 bytes)
93. Topband: More W7IUV preamp (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Mon, 12 Jan 2009 10:09:36 -0800 (PST); The preamp documentation has been updated. The preamp now has its own topic in the main index rather than a sub topic on the Rotatable Flag page. The documentation has been expanded and is in the for; /archives//html/Topband/2009-01/msg00102.html (7,823 bytes)
94. Re: Topband: New moderator (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Thu, 16 Jul 2009 09:08:49 -0700 (PDT); Bill certainly does desreve to be recognized for the outstanding job he has done over theyears. While I sometimes disagreed with his decisions to post or not to post, I cannot argue with success. The; /archives//html/Topband/2009-07/msg00062.html (8,364 bytes)
95. Re: Topband: EWE-----FLAG-----Pennant-----KAZ (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Mon, 10 Aug 2009 11:58:42 -0700 (PDT); QST, July 2000, page 34, "Flag, Pennants and Other Ground-Independent Low-Band Receiving Antennas" by the late Earl, K6SE Larry - W7IUVDN07dg - central WAhttp://w7iuv.com ____________________________; /archives//html/Topband/2009-08/msg00036.html (7,866 bytes)
96. Topband: RX antennas and small vertical arrays (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Fri, 2 Oct 2009 12:35:14 -0700 (PDT); About 50 years ago I started building receive antennas, looking for and hoping to find the "magic solution". About 10 years ago, I finally decided there was no magic, no free lunch. A serious effort; /archives//html/Topband/2009-10/msg00038.html (14,671 bytes)
97. Topband: Low Band preamp (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Wed, 25 Nov 2009 11:05:41 -0800 (PST); Earlier this year I was contacted by Ed, W4EDS, regarding a surface mount technology replacement for the 2N5109 used in my preamp circuit. It sounded like a good idea, but turned out to be a huge und; /archives//html/Topband/2009-11/msg00406.html (8,181 bytes)
98. Re: Topband: 4 sq receive and high power (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Thu, 5 Jan 2012 06:10:45 -0800 (PST); The HI-Z preamps do seem to be immune to any normal high power TX issues. I have had a HI-Z 4-sq up with the closest element only 65 feet away from the TX vertical with no problems running full legal; /archives//html/Topband/2012-01/msg00071.html (9,225 bytes)
99. Topband: More Amplifier info (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Sun, 8 Jul 2012 06:49:17 -0700 (PDT); Interesting thread. Here's some data on that part which I haven't seen before. Communication concepts offers a KW amp kit based on the Freescale part and a Freescale app note. Although the kit is for; /archives//html/Topband/2012-07/msg00098.html (7,731 bytes)
100. Re: Topband: RX 4 squares (score: 1): Author: Larry Molitor <w7iuv@yahoo.com>; Date: Thu, 9 Aug 2012 05:54:59 -0700 (PDT); Bob, My Hi-Z 4-square was only 80 feet from my 160 TX vertical (which is disconnected with relays during RX periods and non-resonant). The other towers, also non-resonant, were about a half wave away; /archives//html/Topband/2012-08/msg00145.html (8,003 bytes)

Current List: 81 - 100
Page: [1] [2] [3] [4] [5] [6]